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A sideline issue that occurred to me while I was reviewing two of my best preferred timelines, Song of Roland and Prince of Peace, what if one of the most theocratic popes of the XI-XIV centuries (e.g. Gregory VII, Innocence III, Boniface VIII) makes his OTL bid for winning the Investiture Controversy and later outright supremacy on the secular kingdoms of Western Europe, but it is met by an ATL stronger power, such as an efficient, centralized Carolingian Franco-German-Italian-Spanish empire, Ottonian-Hohenzollern German-Italian HRE, Angevin-Plantagenet Anglo-French empire, as in Song of Roland and Prince of Peace, is thoroughly defeated and ousted by an ecumenical council for a pro-secular anti-pope, imprisoned for life or executed as an heretic, and the change sticks since all of his successors in the St. Peter's line are nominated from the pro-secular clergy ? So that the precedent and doctrine takes root in the Church that the Pope is not supreme, and can be judged and deposed by a council for abusing his power.

In OTL this outcome came somewhat close to fulfillment, but not quite, in the period between the near-capture of Boniface VIII at Anagni, and the end of the Great Schism. In this kind of ATL, the pro-king, pro-emperor antipope and the counciliar supremacy factions win out in the Church.

What would be the long-term, far-ranging consequences on the doctrine and structure of the Church ?
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